A physical and chemical process filters the water through an exchange media known as resin or zeolite. Typically, the resin is a synthetic or natural, sand-like material coated with positively charged sodium ions. As the calcium and magnesium dissolve into positively charged ions, an ion exchange environment is created. The water flows through the unit while the resin releases its sodium ions and readily trades them for the calcium and magnesium ions. The water flowing out of the device is now considered soft. The new technology SoftPro uses 75% less salt and 64% less water than the older technology making it more efficient than other water softeners, saving you hundreds of dollars per year and is better for the environment.